Anthony McJunkin and his brother, Branden McJunkin, 21, were in their apartment in the Seven Oaks complex in the 5900 block of Danny Kaye on the Northwest Side on early Friday, Aug. 31, 2012, when they began to squabble. Anthony said his brother took a $20 bill from a friend, so he shot him in the chest.

The mother of a San Antonio man accused of shooting and killing his fraternal twin brother over $20 said Wednesday that her son acted in self-defense.

Anthony McJunkin has been held in Bexar County Jail on a murder charge since August, with bail set at $300,000.

The Bexar County district attorney's office hasn't received the case yet from the Police Department and so hasn't presented it to a grand jury for possible indictment, First Assistant District Attorney Cliff Herberg said.

SAPD spokesman Matt Porter said there have been no new developments in the case since the arrest.

Anthony's lawyer, Britt Eastland, said a pre-indictment status conference set for Wednesday was reset.

“I don't even know what the evidence is yet,” Eastland said.

Anthony McJunkin told police it was just a “stupid argument” and that he didn't mean to shoot his Branden McJunkin dead over $20, according to a previous San Antonio Express-News report.

The brothers were in their apartment in the Seven Oaks apartment complex in the 5900 block of Danny Kaye when the shooting occurred during a squabble in which Anthony McJunkin said his brother took a $20 bill from a friend, according to the report.

But Tracy McJunkin told reporters Wednesday that Anthony McJunkin was defending himself against his bigger, burlier twin brother.

Tracy McJunkin said Branden McJunkin was 6 feet tall, weighed about 200 pounds, suffered from severe bipolar disorder and had previously been under a court order to take medications to treat the condition but had stopped taking them as an adult.

“Branden was beating him and beating him,” she said of Anthony McJunkin, who's 6 feet, 2 inches tall and weighs 118 pounds. “Anthony was in imminent danger.”

She added that it's been difficult for her. The twins are “the babies of nine kids,” she said.

“I feel it's a nightmare,” Tracy McJunkin said. “It's so unnatural to bury one child and now to have one facing charges.”